The North Irish Brigade was a brigade of the British army which existed between 1948 and 1968; it consisted of the three regiments from Northern Ireland (each regiment was reduced to a single battalion on 14 July 1948). After the Second World War there were 14 infantry depots in Britain, each bearing a letter. The depots were territorially aligned, and Infantry Depot M at Omagh was aligned with the regiments from Northern Ireland. In 1948, the depots switched to names and this depot became the North Irish Brigade, with all regiments being reduced to a single battalion at the same time.